Multiple Choice
A Quality Analyst wants to construct a control chart for determining whether three machines,all producing the same product,are under control with regard to a particular quality variable.Accordingly,he sampled four units of output from each machine,with the following results: 
What is the sample average range based upon this limited sample?
A) 2.0
B) 4.33
C) 5.4
D) 6.0
E) 9.0
Correct Answer:
Verified
Correct Answer:
Verified
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